From b03ee7032b2ea2d4d22ab7ec1346b7c9331cfc17 Mon Sep 17 00:00:00 2001
From: Petri Hienonen <petri.hienonen@gmail.com>
Date: Wed, 29 Oct 2025 15:18:30 +0200
Subject: Initial commit

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+= Housing selector
+:description: Documentation for the project
+:sectanchors:
+:url-repo: https://git.tammi.cc/housing.git
+
+SVG and WGS94 https://www.w3.org/TR/SVG11/coords.html
+
+The project consists of three parts:
+
+1. Application (native web browser)
+2. CouchDB and S3
+3. Scraper (Golang)
+
+The developments tools are listed in flake.nix and development environment can be start with command:
+
+[source,bash]
+----
+nix develop
+----
+
+== Application
+
+There is a development server `server.js` that serves the app and static assets.
+The application resides in app directory.
+
+[%header,format=tsv]
+|===
+include::app/requirements.tsv[]
+|===
+
+Run (the development server) with:
+
+[source,bash]
+----
+node server.js
+----
+
+Static assets are deployed to web server.
+
+== Scraper runner
+
+Golang is used to fetch the data to CouchDB.
+The runner resides in scrape directory.
+
+[%header,format=tsv]
+|===
+include::scrape/requirements.tsv[]
+|===
+
+The running will require some cookies to be gotten from a web browser. Run with:
+
+[source,bash]
+----
+export OTA_TOKEN=...
+export OTA_CUID=...
+export OTA_LOADED=...
+export PHPSESSID=...
+
+go run main.go
+----
+
+== Next steps
+
+- Implement additional map features, "metro", "pikaraitiotie", "koulut", "kaupat".
+- Add possibility to color districts based on data such as crime rate, etc.
+- Make the weight calculation work.
+- Fix the map zoom and initial viewport
+- Add links to house details on the service. Add additional images
+- Parse more data from data source. Now only overview is parsed.
+- Images on modal open on click to a new window
+- Visual programming? Value function description with javascript?
+- Notifications to user on new houses
+- Sharing via URL
+- Real support for MultiLineString in geometry
+
+== Analysis Data processing
+
+List of open WFS data sources are in:
+https://kartta.hel.fi/avoindata/dokumentit/Aineistolista_wfs_avoindata.html
+
+WFS Capabilities can be found from:
+https://kartta.hel.fi/ws/geoserver/avoindata/wfs?version=2.0.0&request=GetCapabilities
+
+The data can then be downloaded with CURL.
+
+=== Roads
+[source,bash]
+----
+# First download the full dataset
+curl -X GET \
+  "https://kartta.hel.fi/ws/geoserver/avoindata/wfs?\
+service=WFS&\
+version=2.0.0&\
+request=GetFeature&\
+typeNames=avoindata:Liikennevaylat&\
+outputFormat=application/json" \
+  -o liikennevaylat_full.geojson
+
+# Then filter with jq
+jq '{
+  type: .type,
+  features: [.features[] | select(.properties.alatyyppi == "Moottoriväylä")],
+  crs: .crs
+}' liikennevaylat_full.geojson > moottorivaylat.geojson
+----
+
+[source,bash]
+----
+jq '[.features[].properties.paatyyppi | select(. != null)] | unique' liikennevaylat_full.geojson
+----
+
+=== Train stations
+[source,bash]
+----
+curl -X GET \
+  "https://kartta.hel.fi/ws/geoserver/avoindata/wfs?\
+service=WFS&\
+version=2.0.0&\
+request=GetFeature&\
+typeNames=avoindata:Seutukartta_liikenne_juna_asema&\
+outputFormat=application/json&\
+srsName=EPSG:4326" \
+  -o juna_asemat.geojson
+----
+
+
+=== Railway lines
+
+[source,bash]
+----
+curl -X GET \
+  "https://kartta.hel.fi/ws/geoserver/avoindata/wfs?\
+service=WFS&\
+version=2.0.0&\
+request=GetFeature&\
+typeNames=avoindata:Seutukartta_liikenne_juna_rata&\
+outputFormat=application/json&\
+srsName=EPSG:4326" \
+  -o juna_radat.geojson
+----
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